Frequency generator

Details Frequency generator Frequency generator

1988-08-16

1989-08-22

Mis, David

Oscillators

Beat frequency

Plural beating

331 16, 331 40, 455260, H03B 2102, H03L 718

Patent

active

048599689

ABSTRACT:
A frequency synthesizer system generates a clock signal having an adjustable, accurate and stable frequency. The synthesizer produces a first reference frequency FR and an adjustable first intermediate frequency F1 equal to the frequency FR divided by a selectable number (N2/N1) which permits course adjustment of the frequency in steps over a prescribed range. The frequencies FR and F1 are then mixed and filtered to produce a second intermediate frequency FR+F1. The system also generates a second reference frequency F3 which is finely adjustable over a range in the order of magnitude of the frequency difference between two successive steps of the first intermediate frequency F1. This second reference frequency is mixed with the second intermediate frequency and the result is filtered to produce a final frequency FR+F1+F3.

REFERENCES:
patent: 3982199 (1976-09-01), Green
patent: 4458329 (1984-07-01), Remy
patent: 4494073 (1985-01-01), Sorgi
patent: 4558282 (1985-12-01), Lowenschuss
patent: 4630217 (1986-12-01), Smith et al.
patent: 4720688 (1988-01-01), Hasegawa et al.
Frequency Synthesizers--Theory and Design; Third Edition--Vadim Manassewitsch--pp. 1-37 and Preface; and Contents; John Wiley & Sons.

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